Patents by Inventor Karel J. H. Verschoof

Karel J. H. Verschoof has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Contraceptive device
    Patent number: 4537186
    Abstract: Contraceptive device for intra uterine application in the oviducts having two enlargements 1, 2 connected by an oblong connection element 3 to a halter shape which enlargements remain fixed in the muscle tissues since the surface areas of the projections of these enlargements on a plane transverse to the longitudinal axis of the device are almost equal.
    Type: Grant
    Filed: September 2, 1983
    Date of Patent: August 27, 1985
    Inventors: Karel J. H. Verschoof, Jan W. Smit